package com.atguigu.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

@Service //把自己注册成为service层，让包扫描能扫描到。
//注解相当于applicationContext.xml配置文件中配置的<bean id="serviceName">,表示给当前类命名一个别名,方便注入到其他需要用到的类中。
public class PaymentService {
    /**
     * 正常访问
     * */
    public String paymentInfo_OK(Integer id){

        return "线程池： "+Thread.currentThread().getName()+"  paymentInfo_OK,id:  "+id+"\t"+"O(∩_∩)O";
        //线程池
    }
/*
* 服务降级
* */
    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler",commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds",value = "5000")
    })
    public String paymentInfo_TimeOut(Integer id){
/*//        int timeNumber = 5;//3
        */
//        int age = 10/0;
        //SECONDS与MILLISECONDS
        try{ TimeUnit.MILLISECONDS.sleep(3000); }catch (InterruptedException e){e.printStackTrace();}
        return "线程池： "+Thread.currentThread().getName()+"  paymentInfo_TimeOut,id:  "+id+"\t"+"O(∩_∩)O  耗时(秒):";
        //线程池
    }
/*
* 兜底方法，当产生服务降级的时候执行这个方法。
* */
    public String paymentInfo_TimeOutHandler(Integer id) {
        return "线程池： "+Thread.currentThread().getName()+"  paymentInfo_TimeOutHandler,id:  "+id+"\t"+"/(ㄒoㄒ)/~~";
    }
    /**
     * 服务熔断
     * */
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled",value = "true"),//是否开启断路由
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "10"),//请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"),//时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60"),//失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id){
        if (id < 0){
            throw new RuntimeException("******id 不能负数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName()+"\t"+"调用成功，流水号："+serialNumber;
    }
    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id){
        return "id 不能负数，请稍后再试，/(ㄒoㄒ)/~~  id:"+id;
    }
}
